Chromium (total)
City of Aledo
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 5 | 0 | ND |
| 2019 | 3.10 ppb | 3 | 3 | 2.60 ppb - 3.50 ppb |
| 2020 | 1.64 ppb | 5 | 4 | ND - 3.30 ppb |
| 2021 | 1.18 ppb | 5 | 4 | ND - 1.80 ppb |
| 2022 | 0.733 ppb | 3 | 2 | ND - 1.10 ppb |
| 2023 | ND | 5 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2019-08-14 | Q1955170001 | 3.50 ppb |
| 2019-08-14 | Q1955170002 | 2.60 ppb |
| 2019-08-14 | Q1955170015 | 3.20 ppb |
| 2022-09-29 | Q2229352004 | 1.10 ppb |
| 2022-09-29 | Q2229352007 | 1.10 ppb |
| 2022-11-21 | Q2234952003 | ND |